A couple of liberal Harvard law professors are lending their name to a new campaign to build support for expanding the Supreme Court by four justices in 2021.

The campaign, calling itself the 1.20.21 Project and being launched Wednesday, also wants to increase the size of the lower federal courts to counteract what it terms "Republican obstruction, theft and procedural abuse" of the federal judiciary. This includes the recent near party-line confirmation of Justice Brett Kavanaugh that cemented a conservative majority on the Supreme Court.

It is premised on Democratic victories in next month's elections and the 2020 presidential contest that could leave Democrats in charge of Congress and the White House in 2021, a possibility but by no means a sure thing. Additional justices nominated by a Democrat could change the court's ideological direction.

Harvard professors Mark Tushnet and Laurence Tribe are joining an effort being led by political scientist Aaron Belkin. He was a prominent advocate for repealing the "don't ask, don't tell" policy that prohibited LGBT people from serving openly in the military.

The Kavanaugh confirmation was the culmination of a process that started with Republicans blocking many of President Barack Obama's nominees to lower courts and then refusing to consider his Supreme Court nomination of Judge Merrick Garland in 2016, Belkin said. President Donald Trump's victory in November 2016 allowed him to fill the high court vacancy with Justice Neil Gorsuch.